Geisinger Medical Laboratories Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB3173             Geisinger Epic ID: 16292

Specimen type:
Serum or plasma.
Preferred collection container:
Alternate Collection Container:
4 mL green/green-top (sodium heparin) tube
Specimen required:
1 mL aliquot of serum or plasma; minimum 0.5 mL.
Patient preparation:
Draw at peak (2-4 hours after dose) or trough (0.5-1 hour before dose).

Specimen processing instructions:
Centrifuge and immediately separate serum or plasma specimens from the cells into clean, plastic, screw-capped vial(s). 
Transport temperature:
Refrigerated (preferred).
Specimen stability:
Room Temperature: 7 days. Refrigerated: 14 days. Frozen: 30 days.
Rejection criteria:
Stability limits exceeded. Use of serum separator tubes.

Reference interval:
Daily dose 100 mg: Peak 6.5-9.2 ug/mL. Trough 4.5-6.6 ug/mL.
Daily dose 200 mg: Peak 12-16 ug/mL. Trough 8-12 ug/mL.
Daily dose 400 mg: Peak 20-30 ug/mL. Trough 14-20 ug/mL.
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Topamax, TOPR
Quest test code 30965

Performing Locations

Quest Diagnostics

Technical Lead: Michael Weaver    
Frequency: Monday-Saturday morning    
Performed STAT? No
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